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Dropouts. A Statistics professor has observed that for several years about 13% of the students who initially enroll in his Introductory Statistics course withdraw before the end of the semester. A salesman suggests that he try a statistics software package that gets students more involved with computers, predicting that it will cut the dropout rate. The software is expensive, and the salesman offers to let the professor use it for a semester to see if the dropout rate goes down significantly. The professor will have to pay for the software only if he chooses to continue using it.
a) Is this a one-tailed or two-tailed test? Explain.
b) Write the null and alternative hypotheses.
c) In this context, explain what would happen if the professor makes a Type I error.
d) In this context, explain what would happen if the professor makes a Type II error.
e) What is meant by the power of this test?
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What does it suggest? How could it be applied to this project? (Only discuss its application to this project, as an actual implementation would be an advanced-challenge exercise.)
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Define a 1-D array named people Types that can store a maximum of 50 integer values that will be entered at the keyboard.
A, B, and C are fixed and D is random. Do exact tests exist for all effects? If not, propose test statistics for those effects that cannot be directly tested.
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